[vectorIntrinsics] RFR: Merge panama-vector:master

[Sandhya Viswanathan]

On Tue, 18 May 2021 10:16:12 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

> Merge with master. Vector API tests passed on both x86 and aarch64.
> 
> Conflicts are in *.ad. Resolved by moving the code to matcher_*.hpp to align with https://github.com/openjdk/jdk/pull/3947.

Marked as reviewed by sviswanathan (Committer).

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PR: https://git.openjdk.java.net/panama-vector/pull/83